Pliers



Nqv. 29,1927. K 1,651,216

A. A. McGILL PLIERs,

Filed Feb. s, i927 Inventor Amm@ Patented Nov. 29, i927.

UNITED STATE-s ARTHUR e.l Mec-imi, or` WIsNER, ,NEBRAsKAQ PLIEBS. n

Application led yllebruary 3', 1927. Serial No. 165,63"i."'V

surfaces of the jaws, and a secondary fulcrum which is initiallyineffective and located adjacent the gripping surfaces for producingpowerful leverage and a tenacious u grip Yon the object. v n

AAn important feature of the invention be,- yond the employment of thesuccessive double fulcrum action is an adjustable carrier for thesecondary fulcrum, the carrier being movable ata Vpredetern'iined time,then'becomine automatically set and serving to hold the secondaryfulcrum stationary, while the movable jaw pivots about it lto bring itinto substantially parallelism so with the stationary aw, and to producethe efficient grip; a

Theconfiguration of the parts, as well as their intimate association andrelation, will l become more readily apparentfrom the succeedingdetailed description.

In the drawings y Figure 1 is a sideelevation'of pliers constructed inaccordance with the invention showing the jaws open vand the secondary ifulcrum carrier in released position,

y Fig. 2 is a longitudinal sectiontalen approximately upon the plane onthey line Q-2 of Fig. 1, looking in the direction of the arrow,l l

Fig. 3 is a fragmentary perspective lview ofy the movable jaw, y i

F ig. 4 is a perspective view of the secondary fulcrum carrier. ,j

Considering now the drawings'in detail, no it will'be seen that thereference character 1 designates on-e handle or lever which carries thestationary gripping jaw 2. It will be noted that the portion of themateria joining this jaw with the handle is formed of somewhat as a.segment of a circle, this porril) ,3 in inwardly spaced relation to thegrippingr wise firmly fastenedv between the outer Wide tion beingrepresented at 8. `Also, thisportion has a sectory 4 `cut outtherefrom,and the outer arcuate edge of this sector is `provided vwithvratchet teeth 5; disposed on an arc of a predetermined curvature.' Thecurved edge 6 of the segment Bis also of arcuate formation andthe arc'is that of a circle greater than the circle upon which the toothedarcisbased.

Attention is now invited to' Fig.` 3 wherein the movable jaw member,shown at *7,is represented. .Here the referencecharacter 8 .designatesthe complemental lever or handle, 9 the relatively niovable'jaw forcooperat-ion'with the jaw.2,rand*10"the webs 70 which jointhis aw withthe handle 8. These webs are disposed in spaced "parallelism 'to keachother, and are so spaced as topermit 'them to'st'raddle thesegmentalpo'rtion 3.

`VThe lower arcuate edges are formed with notches 11 providing seats forreception of the primary fulcrum pin 12, rigidly mounted on the handle lat the juncture ofthe Vlat'-y ter and 'said 'segmental portion.V yItwill be noted that oney side of the notch :is substan- S ltially hookedin formation, while the vother side is of inclined form to operate' as acam in a manner to be hereinafter made plain.

The secondary fulcrum carrier is'represented generally by the referencecharacter 13, and this comprises a pair of spaced parallel side plates14 of Vsomewhat triangular form, thesame being provided at their apiceswith elongated slots 15. Rigidly or 'otheroo ends is a toothed block 16,the teeth of which are adapted to cooperate with the aforesaid teeth 5.j

In ian opposite corner, are holes 17 cooperating 'with hoies 18 in thewebs 10 to ac'- commodate the secondary fulcrum pintles 19. It Will benoticed from Fig.2, that there are two yof these pintles.y They `arehowever,

referred to, 'as a unit, by theexpression secondary fulcrum. y

It will be noted that the side plates of the ca-rrier'lB are yinterposedbetween'the wings or vwebsflO and the aforesaid segmentl 3. Also'thebloclrv 16 islocated in the open sector 4.v In addition, ya coiledspring isv connected with this blockand the main fulvcrum pin 12, asshown better inVFig. 2.

Y `It is obvious from the foregoing description, thatF when the vpartsare assembled as shown 1n F 1g. 1, 'and the handle 8 is grasped llt) iand moved toward the handle 1, the movable fiile-rum pin 12, in order toobtain the ini-V tial adjustment of the jaws. However` as soon as themovable jaw comes into engagement with the object to be gripped, aresist'- anoe is set up, causing the cam edges of the aforesaid notches11 to ride outwardly or upwardly upon the fulcrum pin 12. y y, Thisbodily kmovement naturally -moves the carrier 14,*outwardly until theteethon the bloclrll engage the teeth 5, Vthus temporarily holding thecari'ier 13 against further swinging movement.- ,A further movement ofthe handler 8, thereby brings the secondary fulcrum 19 into play,whereupon the power is transmitted frein-this fulcrum, which beingclosejto the gripping surface of the jaw, increases i the leverage, andpermits a more sturdy grip to be had.

vlith this arrangement, it is obvious that the ladditien'al movement ofthe jaw 9, upon the secondary fulcrum pins 19 allows` the jaws toycomemore nearly finto parallelism,

thusadaptingthem for gripping flatsided objects as before explained. Ofcourse,

when thel parts are moved 'in a reverse manner the spring 20 retractsthe: carrier and allows the parts to resume initial position.

Undoubtedly by considering the descriptionin connection with thedrawings, aclear understanding of7 thewinvention as to construction andarrangement of part-s, as well fas'l the advantages and operation willbe had.

In view` of this, va more lengthy description "is deemed unnecessary.

Minor'changes comingwithin the held of invention claimed, may beresorted to if desired. v I n j l Having thus described my invention,what I claim as new is :f

1.1:In1a tool :of the classA described, pliers comprisinga jrelativelystationary jaw member embodying a jaw and an operating handle therefor,a main fulcrum pin carried by vsaid handle, a relatively movablel jawymember embodying a jaw, an operating handle fo'r said last named jawpivotallyand mov- ,ably mounted on said main fulc'rum pin, and

means, interposed lbetween ,thev movable' and stationary aw members" andprovided with V a secondary and successivelyoperable fulcrum upon whichthe movable jaw is also mounted.

` v '2.' Ina structure kofthe V'class described,

pliers rcomprising a" stationary jaw member Vembodying L fjaw and an'operating handle therefor, a' main' fulcrumv pin carried by saidhandle,a'movableljaw member including' a jaw ,for cooperationwith saidfirst-named jaw, any operati'ng'handle for lthe movable jaw, the movablejaw and its handle being pivotaliy and shiftably mounted upon the mainfuleium pin, a carrier interposed between saidj aw members and handles,and a. secondary fulcrum carried by said carrier, f

lmain fulcrum pin at the juncture ofl said segment and handle, arelatively movableV jaw member including a jaw, an operating handle forsaid last-named jaw, webs joining the latter jaw with its handle, saidwebs straddling said segment and being provided with notches formingseats for reception of the fulcrum pin. A v

e, Pliers comprising a stationary jaw member having a jaw and anoperating handle therefor connected to said jaw through the medium of arelatively wide segment, a main fulcrum pin yat thejuncture of saidsegmentV and. handle, a relatively movable jaw member including a jaw,an operating handle for said last-named jaw, webs join'- ing` themovable jaw with` its handle', said webs straddling said segment andbeing provided with notches-forming seats for reception of themainfulcrum pin, a secondary fulcrum, and a carrier for said secondaryfulcrum including spaced parallel plates in-Y terposed between saidwebsand sector, saidwebs being i'oclably connected with the secondaryfulcrum on said carrier.

5. In a tool ofthe class described,rpliers comprising a relativelystationary jaw member having a jaw andan operating handle vfor saidstati'ona'ryjaw joined thereto thru the medium of a connecting segment,said segment being formed with an open sector, one edge of which isrvformed into an arcuate toothed rack, a Irelatively movable jaw inem- 1ber includino` a 'aw o Joosed to saidv hrst v'aw an. operating handlefor the movable jaw,

.spaced` parallel webs joining the movable jaw with its handle, aprimary fulcruin pin located at `the juncture of said segment and jARTHUR A. MCGLL.

